Delete asciinema public11/25/2023 ![]() ![]() If you want to dig deeper into what all this means - check my old post on how the GC works here if you want the cliff notes or Maoni’s much more detailed and up to date information about how the GC really works. In this case we see that it is Workstation mode - this informs us that we will see one GC heap and we won’t have dedicated GC threads. NET Core we are running (5.0) and also the version of the GC. We run eeversion just to check the version of.The following commands are commands we run inside the dotnet dump debugger Run dotnet dump analyze to start analyzing the memory dump.Īt this point we are looking to answer two questions.The dump is a snapshot of all the memory used by the process at a given point in time. Run dotnet dump collect -p to collect a memory dump - watch the process informing us that we are capturing the dump.NET Core counters - We can see that the GC Heap Size increases with around 200 MB each iteration Run dotnet counters monitor -p to start looking at the.Reproduce the problem by running the application (every loop adds some more products to the static list).I noticed that the recording unfortunately is a little too wide - so if you can’t see the counters they grow by 200 MB each round - you can also see the recording in full view here ![]() Note: This recording is not a video but an asciinema capture, so you can stop the recording and select text at any point. Here you can see the tools in action on Ubuntu 20.04 running in WSL2 on Windows. So if you look through any of the case studies on this blog you can most likely replicate it in dotnet dump. The commands are extremely similar to the sos commands you use in WinDbg (except you don’t have to start the commands with ! since it is not an extension here). Once you are in the tool, it can feel a bit daunting if you’ve never used it before, but typing the command help will list all the commands you can use. However, the really neat thing is that you can also debug these dumps with dotnet dump analyze both on Linux and Windows. NET 4.0 dumps in Visual Studio 2010 as the concepts are still very similar. You can also review these dumps (both from Windows and Linux) in Visual Studio - I will write a more modern post on how this works nowadays, but you can see a walkthrough of this in one of my old posts Debugging. If you use it on Windows to collect memory dumps you can review the dumps in WindDbg or DebugDiag or any dump debugging tool. Note: Most of the commands have the ps switch that lets you list the processes that can be monitored dotnet dumpĭotnet dump collects a memory dump similar to the dumps you collect with ProcDump or DebugDiag or any other debugging tool. dotnet counters monitor -counters - monitors the ASP.NET Core counters.dotnet counters monitor -p -refresh-interval 1 - displays all the counters and updates every second.NET Core processes we can monitor, so we can get the Process ID NET objects are stored), or the number of garbage collections, assemblies loaded, ASP.NET requests etc. NET core performance counters, or ASP.NET core performance counters like the size of the GC heap (where all your. dotnet countersĭotnet counters helps you either monitor or collect. Many of these are useful when troubleshooting memory leaks, (in particular dotnet gcdump would have been a good choice here, but I will leave that for another post, and focus today on dotnet counters and dotnet dump). dotnet sos: Installs the latest version of sos.dll for.NET core symbols - useful when you debug a memory dump from another machine (in WinDbg or other native debuggers) ![]()
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